681592464 has 120 divisors (see below), whose sum is σ = 2193609600. Its totient is φ = 193526784.

The previous prime is 681592447. The next prime is 681592501. The reversal of 681592464 is 464295186.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166312 + ... + 170360.

It is an arithmetic number, because the mean of its divisors is an integer number (18280080).

Almost surely, 2^681592464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681592464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1096804800).

681592464 is an abundant number, since it is smaller than the sum of its proper divisors (1512017136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681592464 is a wasteful number, since it uses less digits than its factorization.

681592464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4237 (or 4228 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 681592464 is about 26107.3258684224. The cubic root of 681592464 is about 880.0518495620.

The spelling of 681592464 in words is "six hundred eighty-one million, five hundred ninety-two thousand, four hundred sixty-four".